if none of infinity users willl reply- you can try to fond second pinout by yourself. connecting tx and rx to all free pins in all possible combinations.
there is 12 pin connecotor with 4 pins known 3: Tx, 5: Rx, 6: Gnd, 12: Gnd. find where is battery pin also.
this will give 5 known pins in total. so only 7 unknown pins- which give total tx/rx combinations just 42.
can be tryed one by one less than in 20min